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PENSIONS - Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Components of net periodic benefit cost:      
Service cost $ 155 $ 162 $ 250
Interest cost 1,271 1,740 1,687
Expected return on plan assets (318) (375) (926)
Recognized actuarial loss 848 777 1,392
Net periodic benefit cost $ 1,956 $ 2,304 $ 2,403